While Romi is having peaceful days in Harmony Town, Maskping, a mysterious Teenieping, releases all the Jewel Teeniepings of the Jewel Forest on Earth. To save them, three students of the Teenieping School decide to secretly go with the Jewel Heart Wing Phone.
After Romi finally got the Jewel Heart Wing Phone, she comes in contact with Dr. Monziu. The latter decides that the students Teeniepings will help Romi that will once again be in charge of catching all the Teeniepings. Later, Romi receives he Teenieping School, a new house for the Teeniepings.
While the Teeniepings discover Romi's school, Tickleping is having fun tickling everyone in Harmony Town. And, to catch her, the Teeniepings will have to train to put up with the tickling, and the winner will have to fight Tickleping.
Trustping enjoys Ian's new chocolates so much that he eats way too many of them, and gets a bad toothache the very next day. And Owwping, who enters the bakery, makes things even worse.
Lena, Romi's greatest enemy, discovers Wishping. To thank her, Wishping decides to grant Lena 3 wishes. But when Romi finds her, it's too late: Lena refuses to give up Wishping.
Kyle is devastated when he learns that he failed to enter the international pastry school, and decides to leave. Joahping decides to follow him, when she suddenly runs into her friend Patping.
Maskping is in Harmony Town. And to make things worse, while Heartsping is searching for them, Timidping turns Romi and her friends into super small persons.
Dylan encounters MJ, a famous basketball player, and asks for an autograph. But Tidyping, who wants to clean everything, makes the autograph mysteriously disappear.
After the chef quits, the business isn't going well at Eline's Seasoned Chicken Restaurant. To help her mother, Ellie practices day and night, but keeps failing over and over again.
While Trustping and Teeheeping are fighting each other, Trustping suddenly faints. In order to cure Trustping's disease, The Tomato Jewel is needed. With the help of Dadaping, the Teeniepings make everything possible to cure him.
Cozyping enters the Teenieping School and transforms objects into wooly creations - But when the Teeniepings wake up, a bad surprise awaits: there's a giant Heartsping doll.
While everyone is relaxing, Maskping takes control of Romi's teddy bear, to attack the Teenieping School. The Teeniepings get afraid, and Tidyping gets devoured. All of this must end.
Jennie, Romi's other cousin from the Emotions Kingdom, arrives in Harmony Town. But if Romi and she are like sisters, her personal Teenieping Onlyping hates Heartsping, and an argument quickly starts.
Memoping has a really special power: everything she notes in her notebook will become true. And when Romi finds her, a race starts, but Romi can't manage to catch Memoping.
The Royal Teeniepings arrive at the Teenieping School, and they say that the students Teeniepings cannot help Romi properly. To keep their place, the students Teeniepings will have to win a duel.
While Romi is at school, Ladyping, who was tricked by Maskping, enters the bakery and creates her own kingdom, with everyone being at her service, including all the Teeniepings.
While everyone is sleeping, two thieves enter the bakery to steal the Jewelry Box and the Jewel Teeniepings. And when Romi wakes up, it's already too late.
Buddyping is having fun duplicating everything in the bakery. And when Heartsping tries to find him, she gets duplicated into her twin - Good luck finding who's the real one.
Giftping likes to give gifts to everyone. But when she gets chased by Romi, instead of taking her prop, she takes another gift and runs - She will have to recover her magic prop, but how?
Sculptping tries to sculpt a Teenieping of the Jewel Forest, but he can't remember her. Later, his statue is found by the Teeniepings, who take it at the Teenieping School. But suddenly, the statue starts to move.
Jennie invites everyone to go to a picnic, and Heartsping, who has a bad feeling about this, is forced to come. But while everyone is having fun, Maskping suddenly appears.
When Princess Ruby approaches Balletping, the latter reveals her secret: she wants to have a friend to make a ballet with them. But then, she hears about the Teenieping Ballet.
Wonderping, a self-proclaimed heroine, is always here to help others. Everyone is looking for her, but when she appears, she gets Princess Ruby into a lot of trouble.
Since all the Jewel Teeniepings are now caught, a graduation ceremony is organized at the Teenieping School. Everyone joins, even Jennie and the Royal Teeniepings. Let the party begin.
Heartsping has been made prisoner by Maskping. To save them, Romi, helped by Jennie, go to the Emotions Kingdom and they promise to save Heartsping. Meanwhile, the latter discovers in her hiding place something very strange.
After defeating Maskping, Romi finally discovers the whole truth - The story of her friend who stayed in the shadow for way too long - But the battle is not over yet.